Lochinvar Knight 151 Installation & Operation Manual page 18

3
Hydronic piping
Figure 3-5 Multiple Boilers - Single Temperature Zoned with Circulators
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
MAKE UP WATER
AIR SEPARATOR
MAY SUBSTITUTE
LOW LOSS HEADER
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
TEMPERATURE /
PRESSURE
GAUGE
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
NOTICE
for all equipment and detailing required by local codes.
Indoor tank shown for illustration purposes.
18
ZONE #1
PRESSURE
GAUGE
SYSTEM SUPPLY
SENSOR
EXPANSION
TANK
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
UNION
(TYPICAL)
BOILER 2
(MEMBER 1)
Outdoor Knight Boiler Installation & Operation Manual
Model
2 3
151 2" 2"
211 2" 2-1/2"
286 2-1/2" 2-1/2"
ZONE #2 ZONE #3 ZONE #4
ANTI-SCALD
MIXING VALVE
BOILER
CIRCULATOR
DOMESTIC
HOT WATER
CIRCULATOR
DRAIN
BOILER 1
(LEADER)
Number of Units
4 5 6 7
Required Pipe Sizes
2-1/2" 2-1/2" 3" 3"
3" 3" 3-1/2" 4"
3" 3-1/2" 3-1/2" 4"
FLOW CHECK
VALVE
(TYPICAL)
ZONE CIRCULATORS
(TYPICAL)
HOT
WATER
OUT
COLD
WATER
INDIRECT
DHW TANK
IMG00371
8
3-1/2"
4"
5"
IN